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Seasonal patterns of leaf H 2 O 2 content: reflections of leaf phenology, or environmental stress?

Seasonal patterns of leaf H 2 O 2 content: reflections of leaf phenology, or environmental stress? H 2 O 2 is an ubiquitous compound involved in signalling, metabolic control, stress responses and development. The compatibility of leaf tissue levels with these functions has, however, often been questioned. The objective here is to document H 2 O 2 levels and variability under natural conditions, and their underlying causes. Using the FOX method, bulk H 2 O 2 concentrations were analysed in leaf samples from 18 species of herbs and trees throughout the 2006 growing season. Sampling addressing targeted predictions was emphasised in 2007 and 2008. H 2 O 2 levels varied 100-fold through the year, with a main peak in spring. Two hypotheses were examined: (H1) that H 2 O 2 reflects seasonally variable responses to environmental stresses, and (H2) that it reflects metabolism associated with leaf development. Based on poor or inappropriate correlations between H 2 O 2 and indicators of light, temperature or drought stress, support for H1 was minimal. H2 was supported both by seasonal patterns and by targeted analyses of concentration changes throughout leaf development. This study concludes that bulk tissue H 2 O 2 concentrations are poor indicators of stress, and are generally too high to reflect either signalling or metabolic control networks. Instead, the linkage of H 2 O 2 and leaf phenology appears to reflect the roles of H 2 O 2 in cell expansion, lignification and wall cross-linking. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Functional Plant Biology CSIRO Publishing

Seasonal patterns of leaf H 2 O 2 content: reflections of leaf phenology, or environmental stress?

Functional Plant Biology , Volume 36 (8) – Jul 23, 2009

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References (32)

Publisher
CSIRO Publishing
Copyright
CSIRO
ISSN
1445-4408
eISSN
1445-4416
DOI
10.1071/FP09014
Publisher site
See Article on Publisher Site

Abstract

H 2 O 2 is an ubiquitous compound involved in signalling, metabolic control, stress responses and development. The compatibility of leaf tissue levels with these functions has, however, often been questioned. The objective here is to document H 2 O 2 levels and variability under natural conditions, and their underlying causes. Using the FOX method, bulk H 2 O 2 concentrations were analysed in leaf samples from 18 species of herbs and trees throughout the 2006 growing season. Sampling addressing targeted predictions was emphasised in 2007 and 2008. H 2 O 2 levels varied 100-fold through the year, with a main peak in spring. Two hypotheses were examined: (H1) that H 2 O 2 reflects seasonally variable responses to environmental stresses, and (H2) that it reflects metabolism associated with leaf development. Based on poor or inappropriate correlations between H 2 O 2 and indicators of light, temperature or drought stress, support for H1 was minimal. H2 was supported both by seasonal patterns and by targeted analyses of concentration changes throughout leaf development. This study concludes that bulk tissue H 2 O 2 concentrations are poor indicators of stress, and are generally too high to reflect either signalling or metabolic control networks. Instead, the linkage of H 2 O 2 and leaf phenology appears to reflect the roles of H 2 O 2 in cell expansion, lignification and wall cross-linking.

Journal

Functional Plant BiologyCSIRO Publishing

Published: Jul 23, 2009

Keywords: hydrogen peroxide, leaf expansion, leaf toughness, metabolic signalling, oak, oxidative stress, soya bean, soybean, temperate forest, understorey.

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